/**
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.sun.facelets.tag.jsf.core;
import java.io.IOException;
import java.io.Serializable;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import com.sun.facelets.FaceletContext;
import com.sun.facelets.FaceletException;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.TagAttributeException;
import com.sun.facelets.tag.TagConfig;
import com.sun.facelets.tag.TagException;
import com.sun.facelets.tag.TagHandler;
import com.sun.facelets.tag.jsf.ComponentSupport;
import com.sun.facelets.util.ReflectionUtil;
public class PhaseListenerHandler extends TagHandler {
private final static class LazyPhaseListener implements PhaseListener,
Serializable {
private static final long serialVersionUID = -6496143057319213401L;
private final String type;
private final ValueExpression binding;
public LazyPhaseListener(String type, ValueExpression binding) {
this.type = type;
this.binding = binding;
}
private PhaseListener getInstance() {
PhaseListener instance = null;
FacesContext faces = FacesContext.getCurrentInstance();
if (faces == null) {
return null;
}
if (this.binding != null) {
instance = (PhaseListener) binding.getValue(faces
.getELContext());
}
if (instance == null && type != null) {
try {
instance = (PhaseListener) ReflectionUtil.forName(
this.type).newInstance();
} catch (Exception e) {
throw new AbortProcessingException(
"Couldn't Lazily instantiate PhaseListener", e);
}
if (this.binding != null) {
binding.setValue(faces.getELContext(), instance);
}
}
return instance;
}
public void afterPhase(PhaseEvent event) {
PhaseListener pl = this.getInstance();
if (pl != null) {
pl.afterPhase(event);
}
}
public void beforePhase(PhaseEvent event) {
PhaseListener pl = this.getInstance();
if (pl != null) {
pl.beforePhase(event);
}
}
public PhaseId getPhaseId() {
PhaseListener pl = this.getInstance();
return (pl != null) ? pl.getPhaseId() : PhaseId.ANY_PHASE;
}
}
private final TagAttribute binding;
private final String listenerType;
public PhaseListenerHandler(TagConfig config) {
super(config);
TagAttribute type = this.getAttribute("type");
this.binding = this.getAttribute("binding");
if (type != null) {
if (!type.isLiteral()) {
throw new TagAttributeException(type,
"Must be a literal class name of type PhaseListener");
} else {
// test it out
try {
ReflectionUtil.forName(type.getValue());
} catch (ClassNotFoundException e) {
throw new TagAttributeException(type,
"Couldn't qualify PhaseListener", e);
}
}
this.listenerType = type.getValue();
} else {
this.listenerType = null;
}
}
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException, FacesException, FaceletException, ELException {
if (ComponentSupport.isNew(parent)) {
UIViewRoot root = ComponentSupport.getViewRoot(ctx, parent);
if (root == null) {
throw new TagException(this.tag, "UIViewRoot not available");
}
ValueExpression b = null;
if (this.binding != null) {
b = this.binding.getValueExpression(ctx, PhaseListener.class);
}
PhaseListener pl = new LazyPhaseListener(this.listenerType, b);
root.addPhaseListener(pl);
}
}
}